diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-hosts.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-hosts.c | 197 |
1 files changed, 110 insertions, 87 deletions
diff --git a/nis/nss_nisplus/nisplus-hosts.c b/nis/nss_nisplus/nisplus-hosts.c index e6d584dac8..0fdeb8f3f1 100644 --- a/nis/nss_nisplus/nisplus-hosts.c +++ b/nis/nss_nisplus/nisplus-hosts.c @@ -44,72 +44,14 @@ static nis_name *names = NULL; /* Get implementation for some internal functions. */ #include "../../resolv/mapv4v6addr.h" -#define ENTNAME hostent -#define DATABASE "hosts" -#define NEED_H_ERRNO - -#define ENTDATA hostent_data -struct hostent_data - { - unsigned char host_addr[16]; /* IPv4 or IPv6 address. */ - char *h_addr_ptrs[2]; /* Points to that and null terminator. */ - }; - -#define TRAILING_LIST_MEMBER h_aliases -#define TRAILING_LIST_SEPARATOR_P isspace -#include "../../nss/nss_files/files-parse.c" -LINE_PARSER -("#", - { - char *addr; - - STRING_FIELD (addr, isspace, 1); - - /* Parse address. */ - if (inet_pton (AF_INET6, addr, entdata->host_addr) > 0) - { - result->h_addrtype = AF_INET6; - result->h_length = IN6ADDRSZ; - } - else - if (inet_pton (AF_INET, addr, entdata->host_addr) > 0) - { - if (_res.options & RES_USE_INET6) - { - map_v4v6_address ((char *) entdata->host_addr, - (char *) entdata->host_addr); - result->h_addrtype = AF_INET6; - result->h_length = IN6ADDRSZ; - } - else - { - result->h_addrtype = AF_INET; - result->h_length = INADDRSZ; - } - } - else - /* Illegal address: ignore line. */ - return 0; - - /* Store a pointer to the address in the expected form. */ - entdata->h_addr_ptrs[0] = entdata->host_addr; - entdata->h_addr_ptrs[1] = NULL; - result->h_addr_list = entdata->h_addr_ptrs; - - STRING_FIELD (result->h_name, isspace, 1); - } -) - - static int -_nss_nisplus_parse_hostent (nis_result *result, struct hostent *host, +_nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host, char *buffer, size_t buflen) { - char *p = buffer; - size_t room_left = buflen; - int parse_res; unsigned int i; - struct parser_data *data = (void *) buffer; + char *first_unused = buffer; + size_t room_left = buflen; + char *data, *p, *line; if (result == NULL) return 0; @@ -121,43 +63,117 @@ _nss_nisplus_parse_hostent (nis_result *result, struct hostent *host, result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4) return 0; - memset (p, '\0', room_left); - - /* Generate the hosts entry format and use the normal parser */ - if (NISENTRYLEN (0, 2, result) + 1 > room_left) + if (room_left < NISENTRYLEN (0, 2, result) + 1) { __set_errno (ERANGE); return 0; } - strncpy (p, NISENTRYVAL (0, 2, result), - NISENTRYLEN (0, 2, result)); - room_left -= (NISENTRYLEN (0, 2, result) + 1); + + data = first_unused; + if (inet_pton (af, NISENTRYVAL (0, 2, result), data) < 1) + /* Illegal address: ignore line. */ + return 0; + + host->h_addrtype = af; + if (af == AF_INET6) + host->h_length = IN6ADDRSZ; + else + { + if (_res.options & RES_USE_INET6) + { + map_v4v6_address (data, data); + host->h_addrtype = AF_INET6; + host->h_length = IN6ADDRSZ; + } + else + { + host->h_addrtype = AF_INET; + host->h_length = INADDRSZ; + } + } + first_unused+=host->h_length; + room_left-=host->h_length; if (NISENTRYLEN (0, 0, result) + 1 > room_left) { __set_errno (ERANGE); return 0; } - strcat (p, "\t"); - strncat (p, NISENTRYVAL (0, 0, result), NISENTRYLEN (0, 0, result)); + p = stpncpy (first_unused, NISENTRYVAL (0, 0, result), + NISENTRYLEN (0, 0, result)); + *p = '\0'; room_left -= (NISENTRYLEN (0, 0, result) + 1); - /* + 1: We overwrite the last \0 */ + host->h_name = first_unused; + first_unused += NISENTRYLEN (0, 0, result) +1; + p = first_unused; - for (i = 1; i < result->objects.objects_len; i++) + line = p; + for (i = 0; i < result->objects.objects_len; i++) { - if (NISENTRYLEN (i, 1, result) + 1 > room_left) + if (strcmp (NISENTRYVAL (i, 1, result), host->h_name) != 0) + { + if (NISENTRYLEN (i, 1, result) + 2 > room_left) + { + __set_errno (ERANGE); + return 0; + } + p = stpcpy(p, " "); + p = stpncpy (p, NISENTRYVAL (i, 1, result), + NISENTRYLEN (i, 1, result)); + *p = '\0'; + room_left -= (NISENTRYLEN (i, 1, result) + 1); + } + } + ++p; + first_unused = p; + /* Adjust the pointer so it is aligned for + storing pointers. */ + first_unused += __alignof__ (char *) - 1; + first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *)); + host->h_addr_list = (char **) first_unused; + if (room_left < 2 * sizeof (char *)) + { + __set_errno (ERANGE); + return 0; + } + room_left -= (2 * sizeof (char *)); + host->h_addr_list[0] = data; + host->h_addr_list[1] = NULL; + host->h_aliases = &host->h_addr_list[2]; + host->h_aliases[0] = NULL; + + i = 0; + while (*line != '\0') + { + /* Skip leading blanks. */ + while (isspace (*line)) + line++; + + if (*line == '\0') + break; + + if (room_left < sizeof (char *)) { __set_errno (ERANGE); return 0; } - strcat (p, " "); - strcat (p, NISENTRYVAL (i, 1, result)); - room_left -= (NISENTRYLEN (i, 1, result) + 1); + + room_left -= sizeof (char *); + host->h_aliases[i] = line; + + while (*line != '\0' && *line != ' ') + line++; + + if (line != host->h_aliases[i]) + { + *line = '\0'; + line++; + i++; + } } - parse_res = parse_line (p, host, data, buflen); + return 1; - return parse_res; } enum nss_status @@ -249,7 +265,11 @@ internal_nisplus_gethostent_r (struct hostent *host, char *buffer, } } - parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen); + parse_res = _nss_nisplus_parse_hostent (result, AF_INET6, + host, buffer, buflen); + if (!parse_res && errno != ERANGE) + parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host, + buffer, buflen); if (!parse_res && errno == ERANGE) { *herrnop = NETDB_INTERNAL; @@ -326,7 +346,8 @@ _nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host, return retval; } - parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen); + parse_res = + _nss_nisplus_parse_hostent (result, af, host, buffer, buflen); nis_freeresult (result); @@ -360,19 +381,20 @@ _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host, } enum nss_status -_nss_nisplus_gethostbyaddr_r (const char *addr, struct hostent *host, - char *buffer, size_t buflen, int *herrnop) +_nss_nisplus_gethostbyaddr_r (const char *addr, int addrlen, int type, + struct hostent *host, char *buffer, + size_t buflen, int *herrnop) { if (addr == NULL) return NSS_STATUS_NOTFOUND; else { nis_result *result; - char buf[24 + strlen (addr)]; + char buf[1025]; int retval, parse_res; - sprintf(buf, "[addr=%s],hosts.org_dir", addr); - + snprintf(buf, sizeof (buf) -1, "[addr=%s],hosts.org_dir", + inet_ntoa (*(struct in_addr *)addr)); result = nis_list(buf, EXPAND_NAME, NULL, NULL); retval = niserr2nss (result->status); @@ -387,7 +409,8 @@ _nss_nisplus_gethostbyaddr_r (const char *addr, struct hostent *host, return retval; } - parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen); + parse_res = _nss_nisplus_parse_hostent (result, type, host, + buffer, buflen); nis_freeresult (result); |